Usually an action verb takes an -ed ending for past tense. I hope – I hoped; I jump – I jumped
Irregular verbs change form and spelling to make the past tense. I sing – I sang; I drive – I drove
Here are some common action verbs with irregular past tense:
Today I know my math facts. Yesterday I knew my math facts.
Today I have volleyball practice. Yesterday I had volleyball practice.
Today I swim in the pool. Yesterday I swam in the pool.
The only way to know which verbs are irregular is to practice and learn them.
Here are more irregular past tense verbs:
give – gave
bring – brought
think – thought
win – won
break – broke
come – came
fight – fought
buy – bought
fly – flew
Irregular verbs change their spelling when going from present tense to past tense. You must memorize these irregular past tense verbs.